The Ereendavaa Range (north-eastern Mongolia): an additional argument for Mesozoic extension throughout eastern Asia

被引:81
作者
Daoudene, Yannick [1 ]
Gapais, Denis [1 ]
Ledru, Patrick [2 ]
Cocherie, Alain [3 ]
Hocquet, Sebastien [2 ]
Donskaya, Tatiana V. [4 ]
机构
[1] Univ Rennes 1, UMR 6118, CNRS, F-35042 Rennes, France
[2] AREVA NC, Business Unit Mines, F-92084 Paris, France
[3] Bur Rech Geol & Minieres, F-45060 Orleans 2, France
[4] Russian Acad Sci, Siberian Div, Inst Earths Crust, Irkutsk 664033, Russia
关键词
North-eastern Mongolia; Normal shear zone; High-grade metamorphism; U-Pb geochronology; Mesozoic extension; METAMORPHIC CORE COMPLEX; U-TH-PB; OKHOTSK OCEAN; CRETACEOUS MAGMATISM; QUARTZ RIBBONS; CRUSTAL GROWTH; BAIKAL REGION; SHEAR ZONE; C-SLIP; CHINA;
D O I
10.1007/s00531-008-0412-2
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Mesozoic rift basins locally bounding metamorphic core complexes have been recognized in Transbaikalia and northern China. Numerous basement outcrops located between these two regions, in eastern Mongolia, are considered as pre-Palaeozoic in age. One of these, the Ereendavaa Range, appears as a gneissic core marked by amphibolite-facies metamorphic conditions. The range is overlain to the NW by the unmetamorphosed Mesozoic Onon Basin. Below the basin, the upper part of the range consists of a gently NW-dipping shear zone associated with top-to-the-NW motion. The structural pattern is consistent with syn-extensional exhumation of the range. Preliminary geochronological data indicate that the shear zone is late Jurassic to early Cretaceous in age, coeval with the Onon Basin. These new data from eastern Mongolia constitute a link between Transbaikalia and northern China, indicating that NW-SE extensional Mesozoic tectonics occurred throughout the entire region.
引用
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页码:1381 / 1393
页数:13
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